Dental engine.



W. D. WAGAR.

DENTAL ENGINE.

APPLICATION FILED MAY 10, 1913.

. 3 039 I Patented Dec. 30, 1913.

2 BHBETESHEET 1.

'wlLuam D- wag'arz COLUMBIA PLANOGRAPH CDI,WASHINGTON, D. c.

'W. D. .WAGAR.

DENTAL ENGINE.

APPLICATION FILED MAY 10, 1913.

Patented Dec. 30, 1913.

I i a I I I 2 2 l EMMM v COLUMBIA PLANOGRAPH CO.,WASH1NGTON. D. o.

WIitLi M" n. wAeAn, OF MICHIGAN, nonrn DAKOTA.

DENTAL ENGINE.

Specification of Letters Patent.

Patented Dec. 30, 913.

Application filed May 10, 1913; Serial No. 766,877.

acter wherein a maximur'n'amount of power may be derived from a minimum amount of energy.

A further object of the inventionresides in providing device in which the power is derived by the actuation of the foot of the operator and a stillfurther object resides in providing a device which: may be folded compactly for read-y removalfrom place to place.

A still further object resides providing a device which is simple and durable in con struction, inexpensive to manufacture and one which will be very efiicient and useful in operation.

With these and other objects in view, the invention consists in the novel features of construction, combination and arrangement of parts as will be hereinafter referred to and more particularly pointed out in the specification andclaims.

In the accompanying drawings forming a part of this application, Figure l is a front elevation of the device. Fig; 2 is a vertical section therethrough. Fig. 8 is a horizontal section through the same as seen on line 3-3, Fig. 1', looking in the direction of the arrow. Fig. 1 is a vertical section through the upper portion of the device showing the connectionwith the extension rod therefor. Fig. 5 is a plan- View of the clutch member removed. Fig, 6 is a vertical section as seen on line 66, Fig. 52 Fig. 7 is a similar view as seen on line 77,Fig. 5. Fig. 8 is a detail plan view of a portion of the clutch mem ber. Fig. 9 is a section through the foot pieces of the base showing the manner of mounting the same in their effective positions.

In describing my invention, I shall refer to the drawings in which similar reference characters designate corresponding parts throughout the several views and in which 1 indicates a base or housing. of hollow de sign and substantially circular in plan, into the top of which is loosely disposed the lower threaded end of the tubular member 2, said tubular member being rotatably retained in position by means of the nuts 3 and 3 engaged with the threaded end of the member 2, respectively, above and below the top face of the base 1. The upper portion 4 of the tubular member 2 is removably applied thereto, the same being locked in position through the medium of a lug and slot and the purpose of this removable portion will be" hereinafter and more particularly set forth. Removably mounted in the lower end of the tubular member 2', and held rigidly in position by means of the set screw 5 is a ball bearing hub 6, through which is disposed a shaft 7, the same having the cones 8 carried thereon, which engage the ball bearing ends of said hub 6 to rotatably retain said shaft in position in the tubular member. Mounted on the Xtreme lower endof the shaft 7 to be inclosed within the housing or hollow base member 1,- is a fly-wheel; 9 which, obviously, aids in the rotation of said shaft 7.

In order to aid in the support of the base 1 on the floor or other stationary portion of the structure, I have provided a plurality of angular arms 10, one section of each of which is disposed in a casing or housing 11 formed on the outer peripheral edge of the base or housing 1. The outer wall at one end of each of said housings or casings 11, is

notched as shown at 12to receive the opposite angular portions of the arms 10 therein which, when so disposed, spread said arms radially from the base 1, to aid in the support of the latter in position. Disposed within each housing 11, isa partition; wall 13, through which is disposed the portion of thearm 10 disposed within said housing and encircling this portion of the arm 10 is a coil spring 1 1, one end of which contacts with the wall 13 and the other end of which contacts with a disk 15 carried on the free end of this angular portion of the arm 10. The normal tendency of this spring 14 is, therefore, to draw said angular arm 10 inwardly within the housing and when said angular arms are arranged so that the one portion thereof may be received in the notcheslQ of the housings, it will be appreciated that these springs will retain'said arms in their outspread positions, when so disposed. These arms may be, however,

readily disposed to their upright positions as shown in dotted lines in Fig. 1, bye-merely drawing outwardly thereon against the tension of the sprihgs 14L to disengage the portions thereof from the notches 12.

I have provided means for the rotation of the shaft 7 in the tubular member 2 and to this end, a collar 16 is mounted on the upper cone 8 on the shaft 7 and encircling said shaft to have its lower end resting on said collar, is a coil spring 1'7. The upper portion of this coil spring contacts with an additional collar 18 which is loosely mounted on said shaft and snugly fits the inner walls of said tubular member 2.

The upper portion of the shaft 7 is provided with a spiral groove 19 and loosely mounted on said shaft to rest on the collar 18, and cooperate with the spiral groove 19, is a ratchet member 20. This ratchet member consists of an outer casing within which is rigidly mounted a sleeve-like member 21. the lower face of which extends to a point above the lower edge of said casing and is provided with a plurality of sockets or cavities 22 arranged in circular alinement therein. Loosely disposed in the bore of the sleeve-like member 21 is a tubular member 23 which has a disk-like member 24 formed on the lower end thereof, the upper face of which is provided with a plurality of cavities 25, the bottom walls of which are inclined upwardly toward one end thereof, as clearly shown in Fig. 7 of the drawings. Bearing balls 26 are mounted in each of the cavities 25 and when the tubular member 23 is properly applied to the sleeve member 21, said bearing balls are adapted to be partially received in the sockets 22 of the sleeve member 21. This tubular member 23, with the disk member 2 1 having the bearing balls seated therein, is adapted to -be held in position by means of a cap member 27, threaded on the lower end of the casing 20, as shown in Fig. 6 of the drawings. This ratchet member, which forms a substantial clutch member, as will be hereinafter set forth, is loosely applied to the tion of said shaft.

upper portion of the shaft 7 and the inner wall of said tubular member 23 is provided with spiral ribs 28 which are received in the spiral groove 19 of said shaft. It will be seen from this construction, therefore, that the movement of this ratchet member vertically in one direction will cause said shaft to be rotated, but when moved in the opposite direction, will not affect the rota- The device is so 0011- structed that when the ratchet member is moved downwardly on the shaft, against the tension of the spring 17, the tubular member 23 which is loosely mounted in the sleeve member 21, will have a tendency to rotate in a direction, causing the bearing balls 26 to bind against the one wall of the sockets 22 and the one wall of the cavities 25 in the disk 24. The binding of the bearing balls against the walls of the two members named, will prevent the rotative movement of the tubular member in the ratchet member and a continued downward pressure being given said ratchet, will cause said shaft 7 to be rotated. When pressure is released, however, the spring 17 will force said ratchet member to its uppermost posi tion and in so doing, the tubular member 23 of said ratchet will have a tendency to rotate in an opposite direction to the tendency it has in the downward movement and in making a partial rotation in the ratchet member, the bearing balls 26 are forced up into the sockets 22 through the contact therewith of the inclined lower walls of the cavities 25. This tubular member with the disk thereon will, therefore, rotate idly as the ratchet proper is raised to its uppermost position and the shaft 7 will not be affected whatsoever. I have provided a means for the reciprocation of this ratchet member 20 on the shaft and, to this end, a pitman arm 28 is provided, the upper end of which is forked, as shown at 29, and extended through a slot 30 in the tubular member to have pivotal engagement with the ratchet member as clearly shown in Fig. 2 of the drawings. The lower portion of this pitman arm is guided through a guide keeper 31 on the lower outer side of the tubular member and the extreme lower end of said pitman arm has pivotal connection with the projection of a foot pedal 32. This foot pedal is fulcrumed on the outer end of a pivotal supporting bracket or the like 33, the latter being carried on the nut 3 which secures the tubular member 2 to the base 1. It will be seen from this construction that as pressure is placed on the foot pedal 32, the ratchet member 20 will be forced downwardly on the shaft 7 to cause the latter to be rotatedand when pressure is released, said ratchet will be raised, as before described, to raise the pedal 32 to its initial position. It will be seen from this construction, upon which the foot pedal is supported, that when the pedal is disconnected from the pitman 28, the same may be readily raised,- whereby the device may be folded to compact form for shipping or carrying from place to place.

The extreme upper end of the shaft 7 is guided or held in position by means of a guide wall 34, which is mounted in the up per end of the lower section of the tubular portion 2 and suitably connected to the upper end of said shaft 7, is an additional drive shaft 35, the lower portion of which is formed of flexible material, as shown at 36. This shaft 35 is disposed through the upper section 4: of the tubular member 2 and extends through a casing 37. This cas mg is carried on the upper end of a universal joint or knuckle 38, the latter being suitably mounted in the upper end of the upper section 4 of the tubular member and held in various adjusted positions by means of a strong coil spring 39 which is also suitably mounted in said section 4. The casing 37 which projects above the tubular member 2, to a reasonable extent, has a pair of cars or finger pieces 40 thereon, whereby the device may be raised and carried from place to place, when desired, and connected to the casing 37, is an additional extension casing 41. This extension is adapted to connect with a bracket or support 42. The shaft 35 which is also formed in sections and suitably connected together, as shown in Fig. 4 of the drawings, has the upper outer end thereof connected to a bevel gear 43, mounted on the support 42. An

additional bevel gear 4- meshes with the bevel gear 43 and is mounted on a horizontal shaft 45, which extends through a casing 46, the latter being suitably supported on the frame 4-2. The shaft 45 may be connected with any desired form of dental instrument (not shown). If desired, an additional extension may be provided for the driving shaft and easing therefor, to make the device of greater height, when found necessary.

In practice, it will be seen that after the device is once set up and the instrument properly connected to the shaft 45, it is only necessary for the operator to work the pedal 32 to cause said instrument to be rotated at a very great speed, it being understood that with every downward movement given the pedal 32, by action of the operators foot, said pedal will be automatically raised to its initial position by action of the spring 17. It will also be understood from the above description of the construction of the device, that the shaft 7 is caused to rotate through the downward movement of the ratchet member and permitted to remain idle upon the upward movement thereof. The operation of the other parts of the device will be readily understood from the construction shown in the drawing and described hereabove.

It will be noted that in view of theparticular construction shown in connection with the lower end of the tubular member 2 and the base 1, said tubular member, with the parts carried thereon may be disposed to varlous positions with respect to sfild' base, thereby disposing the pedal member in various positions with respect to the base. The pedal member may, therefore, be turned with its adjunctive parts to any position with respect to the base, without affecting the position of said base proper. The dentist may, in accordance with this structure, dispose the device to operative position atany time by merely moving the pedal with his foot to the position so de sired. It must also here be stated that the frame on which the casing for the shaft 45 is mounted, is pivotally supported in position, whereby the gear as may be raised out of engagement with the gear as, when desired.

. From the foregoing it will be seen that I have provided a device which is simple and durable in construction, inexpensive to manufacture and one which will be very eiiicient and useful in operation and while I have particularly described the elements best adapted to perform the functions set forth, it is obvious that various changes in form, proportion and in the minor details of construction may be resorted to without departing from the spirit or sacrificing any of the principles of the invention.

Having thus described this invention, what is claimed is 2- 1. In a dental engine, a base member, a tubular casing mounted thereon, a shaft rotatably mounted in said casing, foot actuating means for rotating said shaft within the casing, an extension for said shaft to project above said casing, said extension being provided with a flexible section, and a casing for said extension shaft having a universal connection with the aforesaid casing.

2. In a dental engine, a base member, a tubular member mounted in connection therewith, a shaft rotatably mounted within said tubular member, and provided with a spiral groove, a clutch member mounted on said shaft having cooperation with the spiral groove thereof to rotate said shaft upon the downward movement of said clutch member, spring means in connection with said clutch member and tubular member to normally force the former to its uppermost position on the shaft, a balance wheel carried on the lower end of said shaft inclosed within said base member, and foot actuating means for said clutch member.

3. In a dental engine, a base member, a tubular member mounted thereon, and extending vertically of the same, a shaft rotatably mounted in said tubular member and provided with a spiral groove adjacent the upper portion of the same, a clutch member comprising a casing, a sleeve member mounted therein and provided with a plurality of sockets in the under face of the same, a tubular member mounted in said sleeve, and provided with spiral ribs on the inner periphery thereof, for reception in the spiral groove of said shaft, a disk-like member carried on the lower end of said tubular member and provided with cavities in the upper face thereof to register with the sockets of said sleeve-like member, the lower walls of said cavities being inclined upwardly toward one end thereof, bearing-balls mounted said' cavities to be partially received in the sockets in said sleeve-like member, a cap member applied to the casing to retain said tubular member with the disk thereon in position within the casing, spring means in connection with the clutch member andsaid tubular member to normally force the former to its uppermost position on the shaft, and foot actuating means in connection with said clutch member to force the same downwardly on the shaft, whereby the latter may be rotated.

4; In a dental engine, a base member, a tubular member mounted thereon, a shaft rotatably mounted in said tubular member, means for the rotation of said shaft, a plurality'of housings mounted on the'outer edge of said base member, the one end of each of said housings having a notch formed in the outer wall thereof, a plurality of angular arms having one section thereof disposed in the aforesaid housings, wall mounted in eachof said housings, a disk member mounted on the free end of each section disposed within a housing, and spring means encircling the'last mentioned" section of each arm between the wall ofthehousing' and the disk at the end of said section, whereby to lock said angulararms in the notches of said housings and-aid in the support of the base member.

5; In a dental engine, a'base member, a tubular member extending vertically ther'e fromand mounted to rotate thereon, a shaft rotatably mounted in said tubular member and having a=balance wheel mountedon the lower end thereof inclos'ed within said base member, a clutch member disposed within said tubular member and designed for cooperation with the shaft therein to rotate the latter upon a predetermined movement of said clutch member, and foot actuating means for said clutch member carried by said tubular member. 1

6. In a dental engine, a base member, a tubular member extending vertically therefrom and mounted to rotate thereon, a shaft rotatably supported Within said tubular member and provided with a balance wheel at the lower end thereof inclosed within said base member, said tubular member being provided with a vertical slot in the Wall thereof, a clutch member disposed within said tubular member and designed for cooperation with said shaft, to rotatethe latter upon movement of said clutch member in one direction, means to normally force said clutch member in the opposite direction, an arm pivotally connected to said clutch member and disposed through the slot of said tubular member to depend on the outer face of the latter, afoot pedal having pivotal connection at its one end to the'lo'wer end of said arm, a supporting bracket pivoted at its inner end to the lower end of said tubular member and similarly connected at its outer end to the opposite end of said pedal.

In testimony whereof I hereunto aflix my signature in the presence of two witnesses;

IVILLIAM D. WAGARr- Witnesses:

O. H. MAsoN, E. D. FITCHETTE.

G'opiesnf this patent ma-y be obtained for fiv'e cents each, by addressing the Commissioner of Patents. WashingtomD'. 0. 

